Turntable



G. R. GEHRANDT.

TURNTABLE.

v APPLICATION FILED SEPT. T5. 1919. T 1,409,372, Patented Mar. 14, 1922.

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G. II. GEHIIANDT.

TURNTABLE.

APPLICATION FILED SEPT. I5. 1919.

1,409,372. Patented Mar. 14, 1922.

2 SHEETS-SHEET 2.

GUSTAV R. GEHBANDT, OF OAK PARK, ILLINOIS, ASSIGNOR TO INTERNATIONAL EARTH-BORING MACHINE CORPORATION, OF CHICAGO, ILLINOIS, A CORPORA- TION OF DELAWARE.

TURNTABLE.

Application led September To all whom if may concern.'y

Be it known that I, GUs'rAv R. GEHRANDT, a citizen of Germany, residing at Oak Park, 1n the county of Cook and State of Illinois, have invented certain new and useful Improvements in Turntables, of which the following is a specification.

This invention relates to turntables.

More particularly, it relates to a turntable for rotatively supporting the .frame of machines, such as boring machines. cranes,

y power shovels, derrioks. etc.

Heretofore it has ordinarily been the practice to compensate or balance the overhanging weight of the frame and the material or appliances carried thereby by counterweights located on opposite sides of the axis about which the frame is rotatable. Such counter-.balancing is objectionable, particularly in mobile machinery, because of the extra weight which must be transported and the additional size and strength which must be given the parts to supportthe additional Weight. Moreover, the ycounterbalane, unless cumbersome and objectionable methods of adjustment are employed, is completely effective for only one load, and any imbalance caused by a variation in the load supported or lifted by the frame. or a change in the application or concentration of the load must be taken up by the axial bearlngs.

An object of the present invention is to provide a turntable which eliminates the above objections.

Another object is to provide a turntable wherein an extending frame carried thereby need not be counter-balanced.

Another object is to provide a. turntable which eifectively compensates the unbalance of aiframe carried thereby.

Another object is to provide an efficient turntable.

Other objects and advantages of the invention will appear from the specification and claims.

An embodiment of the invention is shown in the accompanying drawings in which- Fig. l is a sectional elevation of the turntable.

Fig. 2 is a top plan thereof.

Fig. 3 is an enlarged section through the bearing of the turntable.

Fig. 4 is a section through the ball retaining ring.

Specication of Letters Patent. Patented Mar, 14, 1922.

15, 19.19. Serial No. 323,844.

The turntable is mounted upon a support v5 and has ay rotatable unbalanced frame 6. The support may be mounted upon the frame or body of a vehicle, where the machine is of a mobile type, or upon a suitable foundation, when the machine is of a stationary type. Frame 6 may be of any desired construction', such as a network of angle, channel and I-beams` as shown.

The outer or extending end of frame G carries the working appliance of the machine, such for example as a boring tool, a power shovel, hoisting blocks, etc. The drawing illustratesv an arrangement for carrying and driving a drill or boring tool, (not shown) through a drill spindle T. Spindle 7 is-driven by suitable gearing from a shaft 8. which receives power from a suitable. source` (not shown) throifgh shaft 9, bevel gears 10 and 11, and an intermediate shaft 12. Shaft 12 is the axis about which the frame rotates.

-The base of the turntable comprises a spoked wheel-like frame 15 mounted upon support 5 and rigidly secured thereto by suitable means. such as bolts 16. Frame 15 has la hub 17 encircling shaft 12 and equipped withupper bearings 18 and lower bearings .19 in which the shaft rotates. Near its outer edge frame 15 is provided with an annular boss 20 which forms the.V outer face of a lower ball race for the turntable bearing. The edge of the frame vis formed into an upwardly and outwardly extending annular flange 21. To fiange 21 the top of the upper ball-race is secured. This top is in the form of a reinforced ring 22 fastened to the flange 21 by suitable means, such as through bolts 23. Ring 22 is provided with a boss 24 whose under side forms the outer face of the upper ball race.

Frame 6 is rigidly mounted upon a wheellike frame 25, by means of I-beams'26 and 27. Frame 25 is'provided with a hub 28,v

' faces at right angles to the airisL Vthe position shown, the downwardly directed opening for each ball and is held in proper vertical position by a number of downwardly extendin lugs 33. Lugs 33 are hollowed out on' t eir undersides so that each rests upon the corresponding lower ball race face upon two comparatively small points. This prevents the scraping of grease from the faces of the ball races.

The balls and their races form bearings upon which the turntable rotates about its axis and bea-r the load of the rotatable frame and the appliances carried. thereby. None of the load is carried by the shaft 12.

llVhen the frame is swung to any position the load is distributed into a downwardly directed force or compression, through beam 26, and an upwardly directed force or tension, through beam 2'?. These forces are each taken up by anti-friction bearings spaced at considerable distances from the axis of rotation and having active or bearing Thus, in

force through beam 2G is a compression on the balls in the right hand portion of the lower ball race and a compression on the balls in the left hand portion of the upper ball race. rflesse compressions or the load is tppnsmitted directly to the support on the right hand side of the turntable in the ferm of a compression and through ring 22, flange 2l and bolt i6 to support 5 on the left hand side of the turntable in the form of a tension.

The load is thus distributed or divided into a couple, both components of which Vare resisted Vby or conducted to the support.

` lf the frame is swung to the left the distribution of the load forces is reversed. ln this position of the frame the load is distril uted to the balls in the left. hand portion of the lower ball race and to the balls in the right hand portion of the upper ball race in the form of compression. sion on the balls at the left is directly communicated to support 5, as a compression, while the compression on the balls at the right in the upper race iscommunicated to the support as a tension.

n any position towhich the frame is swung, there is, therefore, a couple distributing the load to the support on opposite sides of the axis. The load is taken up by comparatively frictionless bearings, whose :1ctive faces are spaced some distance from the axis of rotation and at right'angles thereto. The imbalance of the frame and its load is The compres` isioee'ra therefore compensated for and the frame may be readily moved to any position. Counterweights for the frame and its load are ordinarily unnecessary with this turntable.

Having described my invention, what I claim is l. A turntable having a relatively stationary support, a frame to be rotatably carried by the support, an annular member rigidly secured to the support and having an annular bearing surface, a 'removable ring secured to the annular member and providing a second annular bearing surface spaced from the first mentioned surface, and a second annular member rigidly carried by the frame and having an annular flange interposed between the bearing surfaces and communicating the load of the frame thereto in the form of counter-acting compression and tension.

A. turntable having a frame, a support therefor, an annular member rigidly carried by the support and having a fixed and removable annular bearing surface. spaced apart from each other and both. relatively station ary therewith, an annular bearing surface rigidly carried by the frame and interposed between the bearing surfaces of the support, and balls located between the bearing surfaces of the fra-me and support.

3. A. turntable having a support, a shaft supported thereby; a frame jo-urna-led on the shaft; andV means for relieying the shaft of the load of the frame, said means comprisingq a pair of annular spaced apart bearing surfaces rigidly carried by the support, and an annular flange carried by the frame and interposed between the bearing surfaces of the support for communicating the load of the frame to the support in the form of a couple.

Il. fr turntable having a support, a rotatable frame, an annular member rigidly carried by the support and having' a pair of parallel annular bearing faces about the vanis of the frame, a. second annular member 'rigidlyrarried by the frame and having` a pan' of annular bearing faces located besub- 

